In late 2011, we heard the unexpected news that researchers had identified a "new" (read: long lost) Leonardo painting entitled Salvator Mundi ("Savior of the World"). Previously, this panel was thought to exist only as copies and one detailed, 1650 etching by Wenceslaus Hollar (Bohemian, 1607-1677).
"Energy may be likened to the bending of a crossbow; decision, to the releasing of the trigger." - Sun Tzu, The Art of War , c. 5th century BCE. The invention of the crossbow revolutionized warfare, and the technology would spread from Asia through the Middle East and into Europe by the medieval period.
The words vary and very are homophones, meaning that they sound alike but their meanings are different. Definitions The verb vary means to differ, modify, diversify, or deviate. Similarly, vary means to make changes (to something) so that it's not always the same. Both an adjective and an adverb, very is an emphatic word that means truly, absolutely, or extremely.
Phyllis Schlafly was perhaps most famous for her successful mobilization against the Equal Rights Amendment to the United States Constitution in the 1970s. She is often associated with the backlash against the so-called second wave of feminism. Before that, she was active in the ultraconservative wing of the Republican party, and she remained active on many conservative issues.
Although refugees have been a constant and accepted part of human migration for centuries, the development of the nation-state and fixed borders in the 19th century caused countries to shun refugees and turn them into international pariahs. In the past, groups of people facing religious or racial persecution would often move to a more tolerant region.
An ectothermic animal, also commonly known as a "cold-blooded" animal, is one who cannot regulate its own body temperature, so its body temperature fluctuates according to its surroundings. The term ectotherm comes from the Greek ektos , meaning outside, and thermos , which means heat. While common colloquially, the term "cold-blooded" is misleading because ectotherms blood isn't actually cold.
In Delphi, a method is a procedure or function that performs an operation on an object. A class method is a method that operates on a class reference instead of an object reference. If you read between the lines, you will find that class methods are accessible even when you haven't created an instance of the class (the object).
El último año, EE.UU. emitió un total de 6.740.754 visas de turista sus embajadas y consulados de todo el mundo, pero hay una gran diferencia en el porcentaje de visas que se aprueban según la nacionalidad del solicitante. En las estadísticas del año fiscal 2018 de las visas de turista - también conocidas como de placer, paseo, B2 o la conjunta B1/B2 o combinada con la BCC o de láser o de cruce.
The digestive system is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. Inside this tube is a thin, soft membrane lining of epithelial tissue called the mucosa . In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food.
Mesopotamian reed boats constitute the earliest known evidence for deliberately constructed sailing ships, dated to the early Neolithic Ubaid culture of Mesopotamia, about 5500 B.C.E. The small, masted Mesopotamian boats are believed to have facilitated minor but significant long-distance trade between the emerging villages of the Fertile Crescent and the Arabian Neolithic communities of the Persian Gulf.
The Palmer Raids were a series of police raids targeting suspected radical leftist immigrants-particularly Italians and Eastern Europeans-during the Red Scare of late 1919 and early 1920. The arrests, which were directed by Attorney General A. Mitchell Palmer, resulted in thousands of people being detained and hundreds being deported from the United States.
The Cholula massacre was one of the most ruthless actions of conquistador Hernan Cortes in his drive to conquer Mexico. Learn about this historic event. In October of 1519, Spanish conquistadors led by Hernan Cortes assembled the nobles of the Aztec city of Cholula in one of the city courtyards, where Cortes accused them of treachery.
Field trips are a wonderful way for children to connect what they are learning in class to the outside world. For instance, if you are teaching your students about dinosaurs, the best way to wrap up the unit is to bring the class on a field trip to your local dinosaur exhibit at the museum. This way they can get a hands-on view of everything they learned and help them connect what they learned to what they are seeing at the exhibit.
In English grammar, an adjective clause is a dependent clause used as an adjective within a sentence. Also known as an adjectival clause or a relative clause . An adjective clause usually begins with a relative pronoun ( which, that, who, whom, whose ), a relative adverb ( where, when, why ), or a zero relative.
On August 12, 1981, IBM introduced its new revolution in a box, the "Personal Computer" complete with a brand new operating system from Microsoft, a 16-bit computer operating system called MS-DOS 1.0. What Is an Operating System? The operating system or'OS is the foundation software of a computer and schedules tasks, allocates storage, and presents a default interface to the user between applications.
Silly string or ribbon spray is a polymer foam that shoots out of a can as colored "string". The stuff you buy in a can is an acrylate polymer with a surfactant, although most of the can is filled with a propellant to jet the foam out of the container. Since pressurizing a can isn't something most of us can do, homemade silly string uses a simple, forceful chemical reaction to push strings of foam out of a bottle.
Arthur Miller drew inspiration from Greek tragedies in his plays. Like many of the storylines from Ancient Greece, " The Crucible " charts the downfall of a tragic hero: John Proctor. Proctor is the main male character of this modern classic and his story is key throughout the play's four acts. Actors portraying Proctor and students studying Miller's tragic play will find it useful to learn a bit more about this character.
Not much love is lost on the mites and ticks of this world. Most people know little about them, other than the fact that some transmit diseases. The order name, Acari, derives from the Greek word Akari , meaning a small thing. They may be small, but mites and ticks have a big impact on our world. Characteristics Many mites and ticks are ectoparasites of other organisms, while some prey on other arthropods.
Feathers are unique to birds. They are a defining characteristic of the group, meaning simply that if an animal has feathers, then it is a bird. Feathers serve many functions in birds but most notable is the critical role feathers play in enabling birds to fly. Unlike feathers, flight is not a characteristic restricted to birds-bats fly with great agility and insects fluttered through the air several million years before birds joined them.
Eugenics, segregated hospitals and the Tuskegee Syphilis Study exemplify how pervasive racism in health care once was. But even today, racial bias continues to be a factor in medicine. While racial minorities are no longer unknowingly used as guinea pigs for medical research or denied entry into hospitals because of their skin color, studies have found that they don't receive the same standard of care as their white counterparts.
Birds do it, and bees do it - and although we don't know how, how often, or for how long, dinosaurs had sex, too. The reason dinosaur mating is such an enduring mystery is that it's hard to picture a seven-ton Tyrannosaurus Rex male putting the moves on an even bigger female, or a pair of Triceratops managing not to impale themselves on each others' horns as they attempt to perpetuate the species.